Re: Why don't they join the ends?
We also take rings from rings. This 3 bed house had an extension built to get that 3rd bedroom and move the kitchen into it and get a dining room. It was unconsented and there's various naughtiness. We got a leak in the extension flat roof on our side but the water came into next door: No party wall in the roof.
The power for the kitchen (except interestingly for the Oven/range) is looped off the upstairs ring. The water did come through my roof, through the ceiling rose. BANG! I lost light upstairs and in the kitchen. I was cooking by headtorch.
It's all fixed now, shiny new, insulated, roof covering. I could replace the blown ceiling rose and hey presto there was light. The ring still comes off upstairs.
Oh yes. Years ago I was awaiting the Cable installers and had pulled the TV etc out of the corner. I pulled the downstairs sockets fuse and used the time to investigate why the socket there didnae work. There was a flash (insulated screwdriver in operation) and the light went out. There's a standard lamp fixed wire outlet along the wall and they had looped the socket from it, on the lighting circuit and fuses.
I crawled under the house, found a connection box with a spare terminal in easy reach of the cable from the errant socket which they could have used. I used it after taking the single box out and chopping out a bigger hole to provide a double socket properly spurred off the socket ring.
We also bought a standard lamp and actually used the outlet properly.
Then there was the time I had to rebuild the shoddy, non Zed, back gate. The flex to the garage went across the top of the gate on a piece of wood. I lifted it to enable a new gatepost and there was flash. It was ordinary grey indoor flex and years of sunlight had destroyed the insulation. So a new gate also became run properly surface rated armoured cable to the garage. It goes along the ground: there's a small step from the back pavers to the drive and it runs in a custom channel made from some angle iron then up the gatepost and into the garage. The angle iron protects it from rubbish bin wheels. It does not rub the cable.
The Zed gate has been there for nearly 20 years now and is still going strong. Just replaced a broken leaf hinge. It's good for another 5-10 years at least. I do things properly.